High Common-Mode Voltage,
Single-Supply Difference Amplifier
AD8202
FEATURES
FUNCTIONAL BLOCK DIAGRAMS
High common-mode voltage range
−8 V to +28 V at a 5 V supply voltage
Operating temperature range: −40°C to +125°C
Supply voltage range: 3.5 V to 12 V
Low-pass filter (1-pole or 2-pole)
Excellent ac and dc performance
1 mV voltage offset
NC
7
A1
3
A2
4
+V
S
6
AD8202
100kΩ
G = ×10
+IN
A1
–IN
G = ×2
+IN
A2
–IN
8
1
+IN
–IN
5
OUT
10kΩ
200kΩ
200kΩ
1 ppmꢀ°C typical gain drift
10kΩ
80 dB CMRR min dc to 10 kHz
2
APPLICATIONS
NC = NO CONNECT
GND
Transmission control
Diesel injection control
Engine management
Figure 1. SOIC (R) Package Die Form
INDUCTIVE
LOAD
5V
Adaptive suspension control
Vehicle dynamics control
CLAMP
DIODE
OUTPUT
+IN
NC +V OUT
S
BATTERY
14V
GENERAL DESCRIPTION
4-TERM
SHUNT
AD8202
The AD8202 is a single-supply difference amplifier for amplifying
and low-pass filtering small differential voltages in the presence of a
large common-mode voltage (CMV). The input CMV range
extends from −8 V to +28 V at a typical supply voltage of 5 V.
–IN GND A1
A2
POWER
DEVICE
The AD8202 is available in die and packaged form. The MSOP
and SOIC packages are specified over a wide temperature range,
from −40°C to +125°C, making the AD8202 well-suited for use
in many automotive platforms.
COMMON
NC = NO CONNECT
Figure 2. High Line Current Sensor
POWER
DEVICE
5V
Automotive platforms demand precision components for
better system control. The AD8202 provides excellent ac and
dc performance keeping errors to a minimum in the user’s
system. Typical offset and gain drift in the SOIC package are
0.3 μV/°C and 1 ppm/°C, respectively. Typical offset and gain
drift in the MSOP package are 2 μV/°C and 1 ppm/°C, respec-
tively. The device also delivers a minimum CMRR of 80 dB
from dc to 10 kHz.
OUTPUT
+IN
NC +V OUT
S
BATTERY
14V
4-TERM
SHUNT
AD8202
–IN GND A1
A2
CLAMP
DIODE
INDUCTIVE
LOAD
The AD8202 features an externally accessible 100 kΩ resistor
at the output of the Preamp A1 that can be used for low-pass
filter applications and for establishing gains other than 20.
COMMON
NC = NO CONNECT
Figure 3. Low Line Current Sensor
Rev. D
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